My curiousity had
been raised by the number of glyphs in the Tahua tablet:
Zero was once not
necessary to write down. It could be understood anyhow that for
example 36 probably meant 36 decades = 360 (i.e. the number of
days in a rationally defined calendar for the year, with 5¼ days
left out for practical or other reasons).
I concluded that
42 (redmarked above) meant 420, but what period was that?
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